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采用分离式霍普金森(Hopkinson)压杆,结合高速摄影技术对陶粒混凝土圆盘试样进行冲击劈裂试验。用直径为20.0 mm、厚0.5 mm的黄铜圆片作为波形整形器将入射波上升时长延长到约为波在试样中传播用时的2倍。在不同加载率下,对陶粒体积分数不同的圆盘试样进行冲击加载,高速摄影记录到试样的破坏规律,验证了分离式霍普金森压杆巴西劈裂试验结果的正确性。数据分析结果表明:陶粒混凝土中陶粒含量越高,抗拉强度越低;试验时陶粒混凝土受确定的应变率加载,抗拉强度随加载应变率的增大而增大。贴在圆盘试样中心区域的电阻应变片测量到陶粒混凝土破碎时应变约为0.34%。
Split Hopkinson compression rods were used in combination with high-speed photography techniques to perform impact cracking tests on ceramsite concrete disc specimens. Using a brass disc with a diameter of 20.0 mm and a thickness of 0.5 mm as a wave shaper, the length of the incident wave rises to approximately twice that of a wave propagating in the sample. Under different loading rates, the disc specimens with different ceramsite volume fractions were subjected to impact loading. The failure of the specimens was recorded by high-speed photography, and the correctness of the splitting Hopkinson pressure bar Brazilian splitting test results was verified. The data analysis results show that the higher the content of ceramsite in the ceramsite concrete is, the lower the tensile strength is. When the ceramsite concrete is loaded with a certain strain rate, the tensile strength increases with the increase of the strain rate. The resistance strain gauge attached to the central area of the disc specimen measured a strain of approximately 0.34% when the ceramsite concrete was broken.